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Correlating structure and detection properties in HgTe nanocrystal films

Abstract : HgTe nanocrystals (NCs) enable broadly tunable infrared absorption, now commonly used to design light sensors. This material tends to grow under multipodic shapes and does not present well-defined size distributions. Such point generates traps and reduces the particle packing, leading to a reduced mobility. It is thus highly desirable to comprehensively explore the effect of the shape on their performance. Here, we show, using a combination of electron tomography and tight binding simulations, that the charge dissociation is strong within HgTe NCs, but poorly shape dependent. Then, we design a dual-gate field-effect-transistor made of tripod HgTe NCs and use it to generate a planar p–n junction, offering more tunability than its vertical geometry counterpart. Interestingly, the performance of the tripods is higher than sphere ones, and this can be correlated with a stronger Te excess in the case of sphere shapes which is responsible for a higher hole trap density.
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https://hal.archives-ouvertes.fr/hal-03220006
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Submitted on : Thursday, May 6, 2021 - 9:05:01 PM
Last modification on : Tuesday, October 19, 2021 - 11:10:48 AM
Long-term archiving on: : Saturday, August 7, 2021 - 7:45:18 PM

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Sang-Soo Chee, Charlie Gréboval, Debora Magalhaes, Tung Dang, Julien Ramade, et al.. Correlating structure and detection properties in HgTe nanocrystal films. Nano Letters, American Chemical Society, 2021, 21 (10), pp.4145-4151. ⟨10.1021/acs.nanolett.0c04346⟩. ⟨hal-03220006⟩

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